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// For complete examples and data files, please go to https://github.com/groupdocs-metadata/GroupDocs.Metadata-for-.NET
// path to the Word document protected by password
string path = @"C:\\protected.docx";

try
{
  // initialize DocFormat
  DocFormat pdfFormat = new DocFormat(path);

  // and try to get document properties
  var documentProperties = pdfFormat.DocumentProperties;
}
catch (DocumentProtectedException ex)
{
  Console.WriteLine("File is protected by password PDF: {0}", ex.Message);
}